docs: def _read_config_file(args):
      """Decrypt config file, returns a tuple with stages and config."""
      stage = args.stage
      with open(args.config, 'rt') as f:
          config = yaml.safe_load(f.read())
      STATE['stages'] = config['stages']
      config['config'] = _decrypt_item(config['config'], stage=stage, key='',
                                       render=True)
      return config['stages'], config['config']